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Exercise

Rationalize the denominator of the following.

9) [tex]\frac{5}{\sqrt{15}}[/tex]


Sagot :

To rationalize the denominator of the fraction [tex]\(\frac{5}{\sqrt{15}}\)[/tex], follow these steps:

1. Identify the fraction and the irrational denominator:
- The given fraction is [tex]\(\frac{5}{\sqrt{15}}\)[/tex].

2. Multiply both the numerator and the denominator by the radical in the denominator:
- Here, we multiply both the numerator and the denominator by [tex]\(\sqrt{15}\)[/tex].
- This gives us:
[tex]\[ \frac{5}{\sqrt{15}} \times \frac{\sqrt{15}}{\sqrt{15}} \][/tex]

3. Simplify the expression:
- The numerator becomes:
[tex]\[ 5 \times \sqrt{15} = 5\sqrt{15} \][/tex]
- The denominator becomes:
[tex]\[ \sqrt{15} \times \sqrt{15} = 15 \][/tex]

4. Form the new fraction with the rationalized denominator:
- The new fraction is:
[tex]\[ \frac{5\sqrt{15}}{15} \][/tex]

Therefore, the rationalized form of the fraction [tex]\(\frac{5}{\sqrt{15}}\)[/tex] is [tex]\(\frac{5\sqrt{15}}{15}\)[/tex].

Upon evaluating this expression numerically, the numerator approximately equals 19.364916731037084 and the denominator is 15.

So, the final rationalized form is:
[tex]\[ \frac{19.364916731037084}{15} \][/tex]